Alcohol and crash risk — Tennessee Permit Test

Alcohol and crash risk on the Tennessee permit test — 2 rules, each with the reason behind it and a question on it while it is fresh.

The rules

With a BAC of .10 percent, you are 7 times more likely to cause a crash than if you were sober.

A driver at .10 may still feel fine, but the chance of causing a crash has already jumped many times over.

With a BAC of .10 percent, you are seven times more likely to cause a crash than if you were sober.

Tennessee Comprehensive Driver License Manual, p.79

At a BAC of .17 percent, you are 50 times more likely to cause a crash.

At this level the risk is so high that a crash is close to certain on a long enough drive.

At .17 percent BAC, you are 50 times more likely to cause a crash.

Tennessee Comprehensive Driver License Manual, p.79

On the test

At what BAC are you 7 times more likely to cause a crash than when sober?

.10 percent. A driver at .10 may still feel fine, but the chance of causing a crash has already jumped many times over. Tennessee Comprehensive Driver License Manual, p.79: “With a BAC of .10 percent, you are seven times more likely to cause a crash than if you were sober.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

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Where these come from

Every rule here is checked against Tennessee Comprehensive Driver License Manual, published by the Tennessee Department of Safety and Homeland Security, and against the state code itself. Last checked 2026-10-03.